Hellmouth re-opening for Dollhouse? 

all the cast member that have been confirmed for dollhouse are in this forum
link

I doubt any of the buffy actors actually fit any of the main characters that are left, maybe they will appear later on in the series (if fox isn't a jackass about it and lets it get off the ground)

"I'd want Angel and Buffy to be together and Buffy and Cordelia to finally be friends."- Charisma Carpenter

That gets a smile from me :)

boo! cangel and buffy bitch fights are what we want :D

Well, I think she changed her mind cause at the Paley Fest in an interview she said she wants Angel and Cordelia to be together. Lol.

or maybe she means both ;P

"I think at some point she probably will. She will laugh and laugh, and they will all have a good time." ~ Joss Whedon's answer to the question of Buffy finding out about Angel's feelings for Cordelia, AOL Live

I just found that quote, I thought it was interesting.

"If you actually saw these two characters get back together, it would be so different . . . it probably wouldn't even work." ~ David Boreanaz on Buffy and Angel

And I found that one to.